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//! Traits for common operations on C++ vectors.
use crate::{MutPtr, Ptr};
use std::slice;
pub trait Data {
type Output;
/// Returns a pointer to the underlying memory buffer.
///
/// # Safety
///
/// The caller must make sure `self` contains a valid pointer. This function
/// may invoke arbitrary foreign code, so no safety guarantees can be made.
unsafe fn data(&self) -> Self::Output;
}
pub trait DataMut {
type Output;
/// Returns a pointer to the underlying memory buffer.
///
/// # Safety
///
/// The caller must make sure `self` contains a valid pointer. This function
/// may invoke arbitrary foreign code, so no safety guarantees can be made.
unsafe fn data_mut(&mut self) -> Self::Output;
}
pub trait Size {
/// Returns size of the underlying buffer in elements.
///
/// # Safety
///
/// The caller must make sure `self` contains a valid pointer. This function
/// may invoke arbitrary foreign code, so no safety guarantees can be made.
unsafe fn size(&self) -> usize;
}
pub trait VectorAsSlice {
type Item;
/// Returns the content of the vector as a slice.
///
/// # Safety
///
/// The caller must make sure `self` contains a valid pointer. The content must
/// not be read or modified through other ways while the returned slice exists.
/// This function
/// may invoke arbitrary foreign code, so no safety guarantees can be made.
unsafe fn vector_as_slice(&self) -> &[Self::Item];
}
pub trait VectorAsMutSlice {
type Item;
/// Returns the content of the vector as a slice.
///
/// # Safety
///
/// The caller must make sure `self` contains a valid pointer. The content must
/// not be read or modified through other ways while the returned slice exists.
/// This function
/// may invoke arbitrary foreign code, so no safety guarantees can be made.
unsafe fn vector_as_mut_slice(&mut self) -> &mut [Self::Item];
}
impl<V, T> VectorAsSlice for V
where
V: Data<Output = Ptr<T>> + Size,
{
type Item = T;
unsafe fn vector_as_slice(&self) -> &[T] {
let ptr = self.data().as_raw_ptr();
let size = self.size();
slice::from_raw_parts(ptr, size)
}
}
impl<V, T> VectorAsMutSlice for V
where
V: DataMut<Output = MutPtr<T>> + Size,
{
type Item = T;
unsafe fn vector_as_mut_slice(&mut self) -> &mut [T] {
let ptr = self.data_mut().as_mut_raw_ptr();
let size = self.size();
slice::from_raw_parts_mut(ptr, size)
}
}